Please select a subject first
Advertisements
Advertisements
A car acquire a velocity of 72 km per hour in 10 second starting from rest. Find
(1) the acceleration,
(2) the average velocity, and
(3) the distance travelled in this time.
Concept: undefined >> undefined
A car is travelling along the road at 8 ms-1. It accelerates at 1 ms-2 for a distance of 18 m. How fast is it then travelling ?
Concept: undefined >> undefined
Advertisements
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Concept: undefined >> undefined
A boy is sitting on a merry-go-round which is moving with a constant speed of 10 m s−1. This means that the boy is :
Concept: undefined >> undefined
A freely falling object travels 4.9 m in 1st second, 14.7 m in 2 nd second, 24.5 m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of :
Concept: undefined >> undefined
When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then retardation will be :
Concept: undefined >> undefined
Which of the following could not be a unit of acceleration?
Concept: undefined >> undefined
A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
Concept: undefined >> undefined
The slope of a speed-time graph gives:
Concept: undefined >> undefined
Two bodies A and B of equal masses are kept at heights of h and 2h respectively. What will be the ratio of their potential energies?
Concept: undefined >> undefined
Is potential energy a vector or a scalar quantity?
Concept: undefined >> undefined
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
Concept: undefined >> undefined
What happens to the potential energy of a body when its height is doubled?
Concept: undefined >> undefined
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
potential energy acquired by the weights.
Concept: undefined >> undefined
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
work done by the weightlifter
Concept: undefined >> undefined
A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain? (g = 9.8 m/s2)
Concept: undefined >> undefined
To what height should a box of mass 150 kg be lifted, so that its potential energy may become 7350 joules? (g = 9.8 m/s2)
Concept: undefined >> undefined
On what factors does the gravitational potential energy of a body depend?
Concept: undefined >> undefined
Give one example each of a body possessing : (i) kinetic energy, and (ii) potential energy.
Concept: undefined >> undefined
A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
Concept: undefined >> undefined
